Automobile tire pressure relief valve



' P 1941- E. HOLLOWEL'L 2,254,655

AUTOMOBILE TIRE PRESSURE RELIEF VALVE Filed Sept. 20, 1939 FIGURE 5.

INVENTOR. EVERET HOLLOWELL ATTORNE'Y Patented Sept. 2, 1941 UNITEDSTATES PATENT OFFICE AUTOMOBILE TIRE PRESSURE RELIEF VALVE EvcretHollowell, Kansas City, Kans. Application September 20, 1939, Serial No.295,720

2 Claims.

This invention relates to improvements in automobile tire valves andmore particularly to one that will act as an air inflation valve and anair pressure relief valve.

Heretofore tires of automobiles and road rolling equipment have beenknown to blow out or have dangerous air inflated pressures due to hightemperatures caused by a sudden or gradual rise in atmospherictemperatures or by new tires producing an internal frictional heatprobably due to the chemical elements in the walls of the tires when inrolling operation.

An object of the present invention is to provide an improvement in airinflation valves and pressure relief valves to relieve the excess airpressure in a tire above a predetermined point to prevent blowouts andwrecked cars therefrom, the valves and valve seats all being removablefrom the valve stem for quick replacement.

An object of the present invention is to provide an improved combinationair inflation valve and air pressure relief valve with an intake valveand seat, an exhaust valve that seats on said intake valve and a springwith a. valve pin that normally holds both valves together.

Another object of the present invention is to provide a valve stem withan intake valve, an exhaust valve co-operating with and seating againstthe intake valve, the exhaust and intake valve springs bearing againstthe intake valve, the intake valve spring being confined between aspring seat in the valve stem and the intake .valve, a pin being securedto the exhaust valve and passing through the intake valve to compressthe exhaust valve spring.

With these and other objects in view my invention further consists inthe features of construction illustrated in the accompanying drawing,described in the specification and more particularly pointed out in theappended claims.

In the drawing:

Figure 1 is a fragmentary elevational view illustrating the internalparts of my improved valve stem.

Figure 2 is a fragmentary plan view of Figure 1 Figure 3 is afragmentary plan view of Figure 1 with the valve cap and gasket removed.

Figure 4 is a fragmentary sectional plan view taken on line 4-4 ofFigure 1.

Figure 5 is a fragmentary sectional plan view taken on line 5-5 ofFigure 1.

The valve stem base 6 is of the usual and well known construction andhas the usual threaded stem I for receiving the valve clamp plate andnut which are not shown because of well known construction, the stem 1differing from the usual stem by preferably retaining its uniformdiameter the full length thereof. A cap 8 internally threaded andreceiving a gasket 9 shouldered therein at I0 is screwed on to the stemI to close the stem from dust with the exception of the air vents II andI2 therein.

An insert sealing valve seat l3 beveled to permanently seat in the stem1 is held in place by the internal nut I4 threaded at l5, and screwedinto stem l. A groove I6 is made in the internal nut M to provide thesetting or releasing thereof in the stem '5.

An intake or inflation valve I1 is formed in cup shape with thecylindrical edge thereof seating on insert sealing valve seat l8 whichis integral with valve seat l3. The inflation valve I! has a reliefvalve insert sealing seat l9 set in the cup shape portion thereof andreceives the cylindrical edge of the relief valve which is formed to aninverted cup shape.

The valve 20 is secured to the valve pin 2| by solder, brazing or othermeans, the pin passing through the hub 22 of the cup I! and having acompression spring 23 held thereon by the washer 24 and nuts 25. The topend of the spring 23 bears against the cup l1 and thereby normally holdsthe cylindrical edge valve 20 against the valve seat insert IS.

A compression spring 26 is secured to a seat 21 which is supported on aring 28 by legs 29, the ring 28 being tightly secured in the stem 1.This ring can be made integral with the tube without departure from mypresent invention. The top of spring 26 bears against valve cup I! andnormally holds this inflation valve closed. The tube 30 is attached tocup I! and acts as a spring guide.

It is' obvious that when air is forced into the valve stem it will pressagainst the valve cup 20, sealing insert l9, valve cup l1, open thecylindrical edged valve from seat l8 and pass through the stem 1 aroundthe springs 23, 26, and spring seat 21 with legs 29. If too much airpressure is forced into the tire or the tire air pressure is increasedbeyond the predetermined relief spring capacity the relief cylindricaledged valve 20 will rise from the valve insert seat l9 and exhaustengagement with the seat insert, a collar supported within the stem at apoint remote from said seat plug, a spring seat in engagement with thecollar and a compression spring interposed between the valve disc andsaid spring seat. an air passage through the valve disc and a ,secondannular insert in said valve disc surrounding said air passage, anoutwardly opening cup-shaped relief valve member mounted for rimengagement with said second annular insert, a pin on said valve memberand projecting through said passage to a point below said valve disc andextending coaxially of said spring, a second compression spring withinthe first mentioned spring and surrounding said pin, said second springengaging'at one end the said inflation valve disc and at the other endengaging an adjustable abutment on the inner end of said pin.

2. A tire valve structure comprising a stem interiorly threaded at itsouter end, a ported seat plug supported by said threads and having anannular insert surrounding the port and racin the inner end of the stem,a cup-shaped inwardly opening inflation valve disc mounted for rimengagement with the seat insert, a shoulder supported within the stem ata point remote from said seat plug, a spring seat in engagement with theshoulder and a compression spring interposed between the valve disc andsaid spring seat, an air passage through the valve disc and a secondannular insert in said valve disc surrounding said air passage, anoutwardly opening cup-shaped relief valve member mounted for rimengagement with said second annular insert, a pin on said EVERETHOLLOWEIL.

